Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data. Impact summary: A remote QUIC peer that completes the handshake can create a connection-scoped CPU pressure and potentially a Denial of Service using compliant STREAM frames inside the advertised receive window, with low attacker bandwidth. CWE: CWE-407: Inefficient Algorithmic Complexity Description: OpenSSL manages received QUIC stream fragments using a doubly-linked list. While it optimizes for append operations (at the end of the list), it falls back to a head-to-tail linear search for any fragment that does not immediately follow the current `tail`. By manipulating the sequence of offsets, an attacker can force the server to perform O(n^2) operations, consuming excessive CPU time for the QUIC process. FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.

• https://github.com/openssl/openssl/commit/32d0ed8afe1b8c3e7ece725b44663da3d7087a09
• https://github.com/openssl/openssl/commit/ca8402e273af4de5b3f04fa61a0f0c02ce3ae20e
• https://github.com/openssl/openssl/commit/eb2becc0a4baea7f3050a247834d0e5c2ebe1773
• https://github.com/openssl/openssl/commit/f42ae513bbda513b3c121d54834040ee4a0eae1a
• https://openssl-library.org/news/secadv/20260929.txt

• Openssl » Openssl » Version: 3.4.0
  cpe:2.3:a:openssl:openssl:3.4.0
• Openssl » Openssl » Version: 3.4.1
  cpe:2.3:a:openssl:openssl:3.4.1
• Openssl » Openssl » Version: 3.4.2
  cpe:2.3:a:openssl:openssl:3.4.2
• Openssl » Openssl » Version: 3.4.3
  cpe:2.3:a:openssl:openssl:3.4.3
• Openssl » Openssl » Version: 3.4.4
  cpe:2.3:a:openssl:openssl:3.4.4
• Openssl » Openssl » Version: 3.4.5
  cpe:2.3:a:openssl:openssl:3.4.5
• Openssl » Openssl » Version: 3.4.6
  cpe:2.3:a:openssl:openssl:3.4.6
• Openssl » Openssl » Version: 3.4.7
  cpe:2.3:a:openssl:openssl:3.4.7
• Openssl » Openssl » Version: 3.5.0
  cpe:2.3:a:openssl:openssl:3.5.0
• Openssl » Openssl » Version: 3.5.1
  cpe:2.3:a:openssl:openssl:3.5.1
• Openssl » Openssl » Version: 3.5.2
  cpe:2.3:a:openssl:openssl:3.5.2
• Openssl » Openssl » Version: 3.5.3
  cpe:2.3:a:openssl:openssl:3.5.3
• Openssl » Openssl » Version: 3.5.4
  cpe:2.3:a:openssl:openssl:3.5.4
• Openssl » Openssl » Version: 3.5.5
  cpe:2.3:a:openssl:openssl:3.5.5
• Openssl » Openssl » Version: 3.5.6
  cpe:2.3:a:openssl:openssl:3.5.6
• Openssl » Openssl » Version: 3.5.7
  cpe:2.3:a:openssl:openssl:3.5.7
• Openssl » Openssl » Version: 3.5.8
  cpe:2.3:a:openssl:openssl:3.5.8
• Openssl » Openssl » Version: 3.6.0
  cpe:2.3:a:openssl:openssl:3.6.0
• Openssl » Openssl » Version: 3.6.1
  cpe:2.3:a:openssl:openssl:3.6.1
• Openssl » Openssl » Version: 3.6.2
  cpe:2.3:a:openssl:openssl:3.6.2
• Openssl » Openssl » Version: 3.6.3
  cpe:2.3:a:openssl:openssl:3.6.3
• Openssl » Openssl » Version: 3.6.4
  cpe:2.3:a:openssl:openssl:3.6.4
• Openssl » Openssl » Version: 4.0.0
  cpe:2.3:a:openssl:openssl:4.0.0
• Openssl » Openssl » Version: 4.0.2
  cpe:2.3:a:openssl:openssl:4.0.2